148 lines
3.8 KiB
C
148 lines
3.8 KiB
C
/*
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* Copyright (c) 2014 Mike Belopuhov
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* Copyright (c) 2014 Eric Faurot <eric@faurot.net>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER IN
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* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <netinet/in.h>
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#include <netdb.h>
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#include <errno.h>
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#include <event.h>
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#include <resolv.h>
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#include <stdlib.h>
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#include <string.h>
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#include <syslog.h>
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#include <asr.h>
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#include "icb.h"
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#include "icbd.h"
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void dns_done_host(struct asr_result *, void *);
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void dns_done_reverse(struct asr_result *, void *);
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int cmp_addr(struct sockaddr *, struct sockaddr *);
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extern int dodns;
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void
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dns_done_host(struct asr_result *ar, void *arg)
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{
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struct icb_session *is = arg;
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struct addrinfo *res;
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int found = 0;
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if (ISSETF(is->flags, ICB_SF_PENDINGDROP)) {
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if (ar->ar_addrinfo)
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freeaddrinfo(ar->ar_addrinfo);
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free(is);
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return;
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}
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if (ar->ar_gai_errno == 0) {
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if (strncmp(is->hostname, "localhost",
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sizeof "localhost" - 1) == 0)
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strlcpy(is->host, "unknown", ICB_MAXHOSTLEN);
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else if (strlen(is->hostname) < ICB_MAXHOSTLEN) {
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for (res = ar->ar_addrinfo; res; res = res->ai_next) {
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if (cmp_addr(res->ai_addr, (struct sockaddr *)
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&is->ss) == 0) {
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strlcpy(is->host, is->hostname,
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ICB_MAXHOSTLEN);
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found = 1;
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break;
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}
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}
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if (!found)
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icbd_log(is, LOG_WARNING, "hostname %s does "
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"not resolve back to connecting ip %s",
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is->hostname, is->host);
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}
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} else
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icbd_log(is, LOG_DEBUG, "dns resolution failed: %s",
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gai_strerror(ar->ar_gai_errno));
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if (ar->ar_addrinfo)
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freeaddrinfo(ar->ar_addrinfo);
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CLRF(is->flags, ICB_SF_DNSINPROGRESS);
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}
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void
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dns_done_reverse(struct asr_result *ar, void *arg)
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{
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struct icb_session *is = arg;
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struct asr_query *as;
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struct addrinfo hints;
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if (ISSETF(is->flags, ICB_SF_PENDINGDROP)) {
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free(is);
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return;
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}
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if (ar->ar_gai_errno == 0) {
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icbd_log(is, LOG_DEBUG, "reverse dns resolved %s to %s",
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is->host, is->hostname);
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/* try to verify that it resolves back */
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memset(&hints, 0, sizeof(hints));
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hints.ai_family = PF_UNSPEC;
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as = getaddrinfo_async(is->hostname, NULL, &hints, NULL);
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event_asr_run(as, dns_done_host, is);
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} else {
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icbd_log(is, LOG_DEBUG, "reverse dns resolution failed: %s",
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gai_strerror(ar->ar_gai_errno));
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CLRF(is->flags, ICB_SF_DNSINPROGRESS);
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}
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}
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int
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cmp_addr(struct sockaddr *a, struct sockaddr *b)
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{
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if (a->sa_family != b->sa_family)
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return (a->sa_family - b->sa_family);
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if (a->sa_family == AF_INET)
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return (((struct sockaddr_in *)a)->sin_addr.s_addr -
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((struct sockaddr_in *)b)->sin_addr.s_addr);
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if (a->sa_family == AF_INET6)
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return (memcmp(&((struct sockaddr_in6 *)a)->sin6_addr,
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&((struct sockaddr_in6 *)b)->sin6_addr,
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sizeof (struct in6_addr)));
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return -1;
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}
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void
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dns_resolve(struct icb_session *is)
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{
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struct asr_query *as;
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if (!dodns)
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return;
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SETF(is->flags, ICB_SF_DNSINPROGRESS);
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if (verbose)
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icbd_log(is, LOG_DEBUG, "resolving: %s", is->host);
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as = getnameinfo_async((struct sockaddr *)&is->ss,
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((struct sockaddr *)&is->ss)->sa_len, is->hostname,
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sizeof is->hostname, NULL, 0, NI_NOFQDN, NULL);
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event_asr_run(as, dns_done_reverse, is);
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}
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